UNIT SIX : KINGDOM PLANTAE
CLASS : 11
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The plant body is thalloid. The thallus is unbranched or unattached. The thallus is called filament. The young filament is attached to some substratum by the help of basal cells. Each filament consists of many cylindrical cells. The cells are longer than breadth. The cell is surrounded by gelatinous sheath. Cell wall is outermost layer, which is rigid and consists of two layers. The outer layer is made up of pectose and inner layer is made up of cellulose. Two cells in the filament are separated by a common wall, which is called septum. The cytoplasm contains cell inclusions and cell organelles. There is a central vacuole in the centre of well which is surrounded by a layer called tonoplast. The vacuole is filled by a liquid called cell sap. There is a nucleus at the centre of vacuole. In each cell, spirally coiled chloroplast is present in the cytoplasm. In chloroplast, round and spherical bodies are found which are called pyrinoid.
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